Okay then, let's get started. You can click on all of these photos to get a larger view.
Let's take a closer look at those heels now. You could all tell that those heels were WAY too long, so let's ignore that for now. What pops out at me is that his hairline isn't parallel from side to side- his heels are sheared. This photo also shows you that this hoof isn't just contracted in the heels, he's contracted all the way around. Look how his hoof is narrower at the ground than at the hairline. Because of that contraction all of the structures inside his hoof, like the coffin bone and corium, are being severely pinched. There's no way this horse has proper blood flow in there.
Here's another view of those sheared heels. What you can also see from this angle are his lateral cartilages- not only have they been pushed way up into the fetlock, they've been pushed up asymmetrically from the inside by this horse's badly overgrown bars.
Thrice weekly oxine or white lightning soaks are necessary for this horse, but this hoof will not decontract until those bars come out. The thrush came first, shrinking the frog down to a slit, but then the bars grew around it like a concrete wall, holding that contraction in place. Removing those bars will take months, especially since they've jammed so far upward into the hoof.
So what would I do if this were my client?
First I would warn the owner that this horse is going to get worse before he gets better. All that pinching contraction had damaged the internal structures so much that, once this foot frees up and starts flexing again, he's probably going to start abscessing pretty badly. It sounds awful, but it's necessary, abscessing is the only way the body can get rid of dead and damaged tissue. I would also guess that this horse has some muscle and tendon issues from walking around like this, he's going to be quite stiff and lame for a while. I would say that this horse can be helped, but it will take time and patience.
Then I'd do my trim and hope for the best.
If you have questions, please ask. My brain isn't being very cooperative this morning and some of what I've written probably doesn't have the clarity I wish it would.